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Supplementary information on Oil and Gas Exploration and Production (unaudited) (Details 1) - Oil And Gas Producing Activities [Member] - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Consolidated Entitiees [Member]      
Guarantor and Issuer, Guaranteed Security [Line Items]      
Unproved $ 146 $ 892  
Exploration costs 873 758 $ 687
Development costs 10,982 6,914 6,079
Total 12,001 8,564 6,766
Consolidated Entitiees [Member] | Country Of Brazil [Member]      
Guarantor and Issuer, Guaranteed Security [Line Items]      
Unproved 146 892  
Exploration costs 862 707 682
Development costs 10,929 6,883 6,035
Total 11,937 8,482 6,717
Consolidated Entitiees [Member] | South America [Member]      
Guarantor and Issuer, Guaranteed Security [Line Items]      
Exploration costs 11 51 5
Development costs 53 31 44
Total 64 82 49
Consolidated Entitiees [Member] | Foreign countries [member]      
Guarantor and Issuer, Guaranteed Security [Line Items]      
Exploration costs 11 51 5
Development costs 53 31 44
Total 64 82 49
Equity Method Investeee [Member]      
Guarantor and Issuer, Guaranteed Security [Line Items]      
Exploration costs 10 1  
Development costs 37 30 37
Total $ 47 $ 31 $ 37